Mature T/NK-cell lymphomas (C84) ICD-10-CM
The C84 code range covers mature t/nk-cell lymphomas with 98 ICD-10-CM diagnosis codes. 89 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
- personal history of non-Hodgkin lymphoma Z85.72
Codes in the C84 Range 98 codes · 89 billable
- C84 Mature T/NK-cell lymphomasNon-billable
- C84.0 Mycosis fungoidesNon-billable
- C84.00 Mycosis fungoides, unspecified site
- C84.01 Mycosis fungoides, lymph nodes of head, face, and neck
- C84.02 Mycosis fungoides, intrathoracic lymph nodes
- C84.03 Mycosis fungoides, intra-abdominal lymph nodes
- C84.04 Mycosis fungoides, lymph nodes of axilla and upper limb
- C84.05 Mycosis fungoides, lymph nodes of inguinal region and lower limb
- C84.06 Mycosis fungoides, intrapelvic lymph nodes
- C84.07 Mycosis fungoides, spleen
- C84.08 Mycosis fungoides, lymph nodes of multiple sites
- C84.09 Mycosis fungoides, extranodal and solid organ sites
- C84.0A Mycosis fungoides, in remission
- C84.1 Sezary diseaseNon-billable
- C84.10 Sezary disease, unspecified site
- C84.11 Sezary disease, lymph nodes of head, face, and neck
- C84.12 Sezary disease, intrathoracic lymph nodes
- C84.13 Sezary disease, intra-abdominal lymph nodes
- C84.14 Sezary disease, lymph nodes of axilla and upper limb
- C84.15 Sezary disease, lymph nodes of inguinal region and lower limb
- C84.16 Sezary disease, intrapelvic lymph nodes
- C84.17 Sezary disease, spleen
- C84.18 Sezary disease, lymph nodes of multiple sites
- C84.19 Sezary disease, extranodal and solid organ sites
- C84.1A Sezary disease, in remission
- C84.4 Peripheral T-cell lymphoma, not elsewhere classifiedNon-billable
- C84.40 Peripheral T-cell lymphoma, not elsewhere classified, unspecified site
- C84.41 Peripheral T-cell lymphoma, not elsewhere classified, lymph nodes of head, face, and neck
- C84.42 Peripheral T-cell lymphoma, not elsewhere classified, intrathoracic lymph nodes
- C84.43 Peripheral T-cell lymphoma, not elsewhere classified, intra-abdominal lymph nodes
- C84.44 Peripheral T-cell lymphoma, not elsewhere classified, lymph nodes of axilla and upper limb
- C84.45 Peripheral T-cell lymphoma, not elsewhere classified, lymph nodes of inguinal region and lower limb
- C84.46 Peripheral T-cell lymphoma, not elsewhere classified, intrapelvic lymph nodes
- C84.47 Peripheral T-cell lymphoma, not elsewhere classified, spleen
- C84.48 Peripheral T-cell lymphoma, not elsewhere classified, lymph nodes of multiple sites
- C84.49 Peripheral T-cell lymphoma, not elsewhere classified, extranodal and solid organ sites
- C84.4A Peripheral T-cell lymphoma, not elsewhere classified, in remission
- C84.6 Anaplastic large cell lymphoma, ALK-positiveNon-billable
- C84.60 Anaplastic large cell lymphoma, ALK-positive, unspecified site
- C84.61 Anaplastic large cell lymphoma, ALK-positive, lymph nodes of head, face, and neck
- C84.62 Anaplastic large cell lymphoma, ALK-positive, intrathoracic lymph nodes
- C84.63 Anaplastic large cell lymphoma, ALK-positive, intra-abdominal lymph nodes
- C84.64 Anaplastic large cell lymphoma, ALK-positive, lymph nodes of axilla and upper limb
- C84.65 Anaplastic large cell lymphoma, ALK-positive, lymph nodes of inguinal region and lower limb
- C84.66 Anaplastic large cell lymphoma, ALK-positive, intrapelvic lymph nodes
- C84.67 Anaplastic large cell lymphoma, ALK-positive, spleen
- C84.68 Anaplastic large cell lymphoma, ALK-positive, lymph nodes of multiple sites
- C84.69 Anaplastic large cell lymphoma, ALK-positive, extranodal and solid organ sites
- C84.6A Anaplastic large cell lymphoma, ALK-positive, in remission
- C84.7 Anaplastic large cell lymphoma, ALK-negativeNon-billable
- C84.70 Anaplastic large cell lymphoma, ALK-negative, unspecified site
- C84.71 Anaplastic large cell lymphoma, ALK-negative, lymph nodes of head, face, and neck
- C84.72 Anaplastic large cell lymphoma, ALK-negative, intrathoracic lymph nodes
- C84.73 Anaplastic large cell lymphoma, ALK-negative, intra-abdominal lymph nodes
- C84.74 Anaplastic large cell lymphoma, ALK-negative, lymph nodes of axilla and upper limb
- C84.75 Anaplastic large cell lymphoma, ALK-negative, lymph nodes of inguinal region and lower limb
- C84.76 Anaplastic large cell lymphoma, ALK-negative, intrapelvic lymph nodes
- C84.77 Anaplastic large cell lymphoma, ALK-negative, spleen
- C84.78 Anaplastic large cell lymphoma, ALK-negative, lymph nodes of multiple sites
- C84.79 Anaplastic large cell lymphoma, ALK-negative, extranodal and solid organ sites
- C84.7A Anaplastic large cell lymphoma, ALK-negative, breast
- C84.7B Anaplastic large cell lymphoma, ALK-negative, in remission
- C84.9 Mature T/NK-cell lymphomas, unspecifiedNon-billable
- C84.90 Mature T/NK-cell lymphomas, unspecified, unspecified site
- C84.91 Mature T/NK-cell lymphomas, unspecified, lymph nodes of head, face, and neck
- C84.92 Mature T/NK-cell lymphomas, unspecified, intrathoracic lymph nodes
- C84.93 Mature T/NK-cell lymphomas, unspecified, intra-abdominal lymph nodes
- C84.94 Mature T/NK-cell lymphomas, unspecified, lymph nodes of axilla and upper limb
- C84.95 Mature T/NK-cell lymphomas, unspecified, lymph nodes of inguinal region and lower limb
- C84.96 Mature T/NK-cell lymphomas, unspecified, intrapelvic lymph nodes
- C84.97 Mature T/NK-cell lymphomas, unspecified, spleen
- C84.98 Mature T/NK-cell lymphomas, unspecified, lymph nodes of multiple sites
- C84.99 Mature T/NK-cell lymphomas, unspecified, extranodal and solid organ sites
- C84.9A Mature T/NK-cell lymphomas, unspecified, in remission
- C84.A Cutaneous T-cell lymphoma, unspecifiedNon-billable
- C84.A0 Cutaneous T-cell lymphoma, unspecified, unspecified site
- C84.A1 Cutaneous T-cell lymphoma, unspecified lymph nodes of head, face, and neck
- C84.A2 Cutaneous T-cell lymphoma, unspecified, intrathoracic lymph nodes
- C84.A3 Cutaneous T-cell lymphoma, unspecified, intra-abdominal lymph nodes
- C84.A4 Cutaneous T-cell lymphoma, unspecified, lymph nodes of axilla and upper limb
- C84.A5 Cutaneous T-cell lymphoma, unspecified, lymph nodes of inguinal region and lower limb
- C84.A6 Cutaneous T-cell lymphoma, unspecified, intrapelvic lymph nodes
- C84.A7 Cutaneous T-cell lymphoma, unspecified, spleen
- C84.A8 Cutaneous T-cell lymphoma, unspecified, lymph nodes of multiple sites
- C84.A9 Cutaneous T-cell lymphoma, unspecified, extranodal and solid organ sites
- C84.AA Cutaneous T-cell lymphoma, unspecified, in remission
- C84.Z Other mature T/NK-cell lymphomasNon-billable
- C84.Z0 Other mature T/NK-cell lymphomas, unspecified site
- C84.Z1 Other mature T/NK-cell lymphomas, lymph nodes of head, face, and neck
- C84.Z2 Other mature T/NK-cell lymphomas, intrathoracic lymph nodes
- C84.Z3 Other mature T/NK-cell lymphomas, intra-abdominal lymph nodes
- C84.Z4 Other mature T/NK-cell lymphomas, lymph nodes of axilla and upper limb
- C84.Z5 Other mature T/NK-cell lymphomas, lymph nodes of inguinal region and lower limb
- C84.Z6 Other mature T/NK-cell lymphomas, intrapelvic lymph nodes
- C84.Z7 Other mature T/NK-cell lymphomas, spleen
- C84.Z8 Other mature T/NK-cell lymphomas, lymph nodes of multiple sites
- C84.Z9 Other mature T/NK-cell lymphomas, extranodal and solid organ sites
- C84.ZA Other mature T/NK-cell lymphomas, in remission
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the C84 range.
Lymphoma, Large-Cell, Anaplastic
A systemic, large-cell, non-Hodgkin, malignant lymphoma characterized by cells with pleomorphic appearance and expressing the CD30 ANTIGEN. These so-called hallmark cells have lobulated and indented nuclei. This lymphoma is often mistaken for metastatic carcinoma and MALIGNANT HISTIOCYTOSIS.
Lymphoma, T-Cell, Cutaneous
A group of lymphomas exhibiting clonal expansion of malignant T-lymphocytes arrested at varying stages of differentiation as well as malignant infiltration of the skin. MYCOSIS FUNGOIDES; SEZARY SYNDROME; LYMPHOMATOID PAPULOSIS; and PRIMARY CUTANEOUS ANAPLASTIC LARGE CELL LYMPHOMA are the best characterized of these disorders.
Lymphoma, T-Cell, Peripheral
A group of malignant lymphomas thought to derive from peripheral T-lymphocytes in lymph nodes and other nonlymphoid sites. They include a broad spectrum of lymphocyte morphology, but in all instances express T-cell markers admixed with epithelioid histiocytes, plasma cells, and eosinophils. Although markedly similar to large-cell immunoblastic lymphoma (LYMPHOMA, LARGE-CELL, IMMUNOBLASTIC), this group's unique features warrant separate treatment.
Mature T-Cell and NK-Cell Non-Hodgkin Lymphoma
This type of lymphoma is not frequently seen in the western hemisphere. Clinically, with the exception of anaplastic large cell lymphoma, mature T- and NK-cell lymphomas are among the most aggressive of all hematopoietic neoplasms. Representative disease entities include mycosis fungoides, angioimmunoblastic T-cell lymphoma, hepatosplenic T-cell lymphoma, and anaplastic large cell lymphoma.
Mycosis Fungoides
A chronic, malignant T-cell lymphoma of the skin. In the late stages, the LYMPH NODES and viscera are affected.
Sezary Syndrome
A generalized peripheral (mature) T-cell neoplasm characterized by the presence of erythroderma, lymphadenopathy, and neoplastic, cerebriform T-lymphocytes in the blood. Sezary syndrome is an aggressive disease. (WHO, 2001)
About the C84 Code Range
Mature T/NK-cell lymphomas include mycosis fungoides, Sezary disease, and anaplastic large cell lymphoma.
The main groups separate lymphoma types. C84.0 identifies mycosis fungoides, C84.1 identifies Sezary disease, and C84.4 identifies peripheral T-cell lymphoma not elsewhere classified. Anaplastic large cell lymphoma splits into ALK-positive C84.6 and ALK-negative C84.7 groups. The remaining groups identify unspecified mature T/NK-cell lymphoma C84.9, unspecified cutaneous (skin) T-cell lymphoma C84.A, and other mature T/NK-cell lymphomas C84.Z.
Within each group, subdivisions distinguish body sites or remission. Sites include lymph node regions, the spleen, multiple lymph node sites, and sites outside lymph nodes. The ALK-negative group also distinguishes the breast.
Questions About This Page
How many billable codes are in the C84 range?
Of the 98 codes in this range, 89 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the C84 range classify?
The range classifies mature t/nk-cell lymphomas. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
